Non-Linear Finite Element Analysis of Flexible Pipes for Deep-Water Applications
Aims of the project include the development of refined finite-element models for the simulation of the non-linear behaviour of deep-water marine risers accounting for frictional contact and additional material and geometrical non-linearities.
A two-level sequential multiscale framework is currently under investigation consisting of
- a new corotational, elastoplastic beam element for flexible pipe modelling,
- a representative volume element (RVE) consisting of a detailed shell-element model with interlaminar friction
- a scale-linking scheme for a multiscale analysis using (1) and (2), justified using homogenisation theory.
This enables wire stress-history data to be recovered for fatigue evaluation by postprocessing the results of a large-scale dynamic analysis using (1).
Methods involve the use of user defined subroutines in the commercial finite element code Abaqus using programming in FORTRAN.